About BlastCycle

What BlastCycle Is — and Isn’t

BlastCycle is an independent, advertising-supported site built around six free calculators and a set of guides for road, mountain, and e-bike riders — the numbers people reach for when they’re planning a ride, comparing a drivetrain, or trying to size a bike correctly. It doesn’t sell bikes or parts, it isn’t a coaching service, and it isn’t affiliated with any bicycle brand, component maker, race organizer, or cycling governing body that a guide or a museum entry happens to mention.

What it covers: working out your power-to-weight in watts per kilogram, the gear ratio and gear inches of a drivetrain, the calories a ride burns, your speed from cadence and gearing or from distance and time, a recommended frame size, and the correct chain length for a bike. What it doesn’t cover: a personalized training plan, a diagnosis of what’s actually wrong with your bike, or a substitute for a proper bike fit. Every tool takes the numbers you enter and runs them through a standard formula — the result is a planning estimate, not a measurement of your body or your bike.

A couple of these numbers touch safety, so treat them accordingly: have a qualified bike mechanic verify safety-critical work like chain length and drivetrain fit before you ride, consult a physician before starting a new training program, and wear a helmet every time you get on a bike. This site runs on ads, which is how it stays free to use — that doesn’t change what any of the tools are for or how their numbers are calculated.

The Six Tools

Everything on the site is built around these calculators:

• Cycling Power-to-Weight Calculator — your FTP and body weight, turned into watts per kilogram, with an optional bike weight for the system W/kg that matters on a climb.
• Bike Gear Ratio Calculator — chainring and cog teeth plus wheel size, turned into gear ratio, gear inches, and the speed a given cadence produces.
• Cycling Calorie Calculator — a MET-based estimate of calories burned from your weight, ride time, and intensity.
• Bike Speed Calculator — speed worked out from cadence and gearing, or from distance and time, shown in both km/h and mph.
• Bike Frame Size Calculator — a recommended frame size and size range from your height and inseam, for road, mountain, and hybrid bikes.
• Bike Chain Length Calculator — the correct chain length from chainstay length and your largest chainring and cog, using the standard formula, given in inches and exact links.

Guides and the Museum

Past the calculators, the blog covers riding, gear, and maintenance topics, and the reference section works through terms and concepts riders run into. The Museum of Cycling & the Bicycleis a separate, browsable collection covering the evolution of the machine from the dandy horse to the e-bike, the anatomy of a modern bike part by part, the great races from the Tour de France to Paris–Roubaix, and the culture and gear of the sport — every entry, image, and fact drawn from Wikipedia and Wikimedia Commons.

Questions or Feedback

If a tool gave you a number that looks wrong, a link is broken, or you just want to point something out, the contact page has the email address.